2 * Network Block Device - server
4 * Copyright 1996-1998 Pavel Machek, distribute under GPL
5 * <pavel@atrey.karlin.mff.cuni.cz>
6 * Copyright 2001-2004 Wouter Verhelst <wouter@debian.org>
7 * Copyright 2002 Anton Altaparmakov <aia21@cam.ac.uk>
9 * Version 1.0 - hopefully 64-bit-clean
10 * Version 1.1 - merging enhancements from Josh Parsons, <josh@coombs.anu.edu.au>
11 * Version 1.2 - autodetect size of block devices, thanx to Peter T. Breuer" <ptb@it.uc3m.es>
12 * Version 1.5 - can compile on Unix systems that don't have 64 bit integer
13 * type, or don't have 64 bit file offsets by defining FS_32BIT
14 * in compile options for nbd-server *only*. This can be done
15 * with make FSCHOICE=-DFS_32BIT nbd-server. (I don't have the
16 * original autoconf input file, or I would make it a configure
17 * option.) Ken Yap <ken@nlc.net.au>.
18 * Version 1.6 - fix autodetection of block device size and really make 64 bit
19 * clean on 32 bit machines. Anton Altaparmakov <aia21@cam.ac.uk>
20 * Version 2.0 - Version synchronised with client
21 * Version 2.1 - Reap zombie client processes when they exit. Removed
22 * (uncommented) the _IO magic, it's no longer necessary. Wouter
23 * Verhelst <wouter@debian.org>
24 * Version 2.2 - Auto switch to read-only mode (usefull for floppies).
25 * Version 2.3 - Fixed code so that Large File Support works. This
26 * removes the FS_32BIT compile-time directive; define
27 * _FILE_OFFSET_BITS=64 and _LARGEFILE_SOURCE if you used to be
28 * using FS_32BIT. This will allow you to use files >2GB instead of
29 * having to use the -m option. Wouter Verhelst <wouter@debian.org>
30 * Version 2.4 - Added code to keep track of children, so that we can
31 * properly kill them from initscripts. Add a call to daemon(),
32 * so that processes don't think they have to wait for us, which is
33 * interesting for initscripts as well. Wouter Verhelst
35 * Version 2.5 - Bugfix release: forgot to reset child_arraysize to
36 * zero after fork()ing, resulting in nbd-server going berserk
37 * when it receives a signal with at least one child open. Wouter
38 * Verhelst <wouter@debian.org>
39 * 10/10/2003 - Added socket option SO_KEEPALIVE (sf.net bug 819235);
40 * rectified type of mainloop::size_host (sf.net bugs 814435 and
41 * 817385); close the PID file after writing to it, so that the
42 * daemon can actually be found. Wouter Verhelst
44 * 10/10/2003 - Size of the data "size_host" was wrong and so was not
45 * correctly put in network endianness. Many types were corrected
46 * (size_t and off_t instead of int). <vspaceg@sourceforge.net>
47 * Version 2.6 - Some code cleanup.
48 * Version 2.7 - Better build system.
49 * 11/02/2004 - Doxygenified the source, modularized it a bit. Needs a
50 * lot more work, but this is a start. Wouter Verhelst
54 /* Includes LFS defines, which defines behaviours of some of the following
55 * headers, so must come before those */
58 #include <sys/types.h>
59 #include <sys/socket.h>
61 #include <sys/select.h> /* select */
62 #include <sys/wait.h> /* wait */
63 #ifdef HAVE_SYS_IOCTL_H
64 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_MOUNT_H
68 #include <sys/mount.h> /* For BLKGETSIZE */
70 #include <signal.h> /* sigaction */
72 #include <netinet/tcp.h>
73 #include <netinet/in.h> /* sockaddr_in, htons, in_addr */
74 #include <netdb.h> /* hostent, gethostby*, getservby* */
81 #include <arpa/inet.h>
91 /* used in cliserv.h, so must come first */
92 #define MY_NAME "nbd_server"
95 /** Default position of the config file */
97 #define SYSCONFDIR "/etc"
99 #define CFILE SYSCONFDIR "/nbd-server/config"
101 /** Where our config file actually is */
102 gchar* config_file_pos;
104 /** What user we're running as */
106 /** What group we're running as */
107 gchar* rungroup=NULL;
109 /** Logging macros, now nothing goes to syslog unless you say ISSERVER */
111 #define msg2(a,b) syslog(a,b)
112 #define msg3(a,b,c) syslog(a,b,c)
113 #define msg4(a,b,c,d) syslog(a,b,c,d)
115 #define msg2(a,b) g_message(b)
116 #define msg3(a,b,c) g_message(b,c)
117 #define msg4(a,b,c,d) g_message(b,c,d)
120 /* Debugging macros */
123 #define DEBUG( a ) printf( a )
124 #define DEBUG2( a,b ) printf( a,b )
125 #define DEBUG3( a,b,c ) printf( a,b,c )
126 #define DEBUG4( a,b,c,d ) printf( a,b,c,d )
129 #define DEBUG2( a,b )
130 #define DEBUG3( a,b,c )
131 #define DEBUG4( a,b,c,d )
133 #ifndef PACKAGE_VERSION
134 #define PACKAGE_VERSION ""
137 * The highest value a variable of type off_t can reach. This is a signed
138 * integer, so set all bits except for the leftmost one.
140 #define OFFT_MAX ~((off_t)1<<(sizeof(off_t)*8-1))
141 #define LINELEN 256 /**< Size of static buffer used to read the
142 authorization file (yuck) */
143 #define BUFSIZE (1024*1024) /**< Size of buffer that can hold requests */
144 #define DIFFPAGESIZE 4096 /**< diff file uses those chunks */
145 #define F_READONLY 1 /**< flag to tell us a file is readonly */
146 #define F_MULTIFILE 2 /**< flag to tell us a file is exported using -m */
147 #define F_COPYONWRITE 4 /**< flag to tell us a file is exported using
149 #define F_AUTOREADONLY 8 /**< flag to tell us a file is set to autoreadonly */
150 #define F_SPARSE 16 /**< flag to tell us copyronwrite should use a sparse file */
151 #define F_SDP 32 /**< flag to tell us the export should be done using the Socket Direct Protocol for RDMA */
152 GHashTable *children;
153 char pidfname[256]; /**< name of our PID file */
154 char pidftemplate[256]; /**< template to be used for the filename of the PID file */
155 char default_authname[] = SYSCONFDIR "/nbd-server/allow"; /**< default name of allow file */
158 * Types of virtuatlization
161 VIRT_NONE=0, /**< No virtualization */
162 VIRT_IPLIT, /**< Literal IP address as part of the filename */
163 VIRT_IPHASH, /**< Replacing all dots in an ip address by a / before
164 doing the same as in IPLIT */
165 VIRT_CIDR, /**< Every subnet in its own directory */
169 * Variables associated with a server.
172 gchar* exportname; /**< (unprocessed) filename of the file we're exporting */
173 off_t expected_size; /**< size of the exported file as it was told to
174 us through configuration */
175 gchar* listenaddr; /**< The IP address we're listening on */
176 unsigned int port; /**< port we're exporting this file at */
177 char* authname; /**< filename of the authorization file */
178 int flags; /**< flags associated with this exported file */
179 int socket; /**< The socket of this server. */
180 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
181 uint8_t cidrlen; /**< The length of the mask when we use
182 CIDR-style virtualization */
183 gchar* prerun; /**< command to be ran after connecting a client,
184 but before starting to serve */
185 gchar* postrun; /**< command that will be ran after the client
190 * Variables associated with a client socket.
193 int fhandle; /**< file descriptor */
194 off_t startoff; /**< starting offset of this file */
198 off_t exportsize; /**< size of the file we're exporting */
199 char *clientname; /**< peer */
200 char *exportname; /**< (processed) filename of the file we're exporting */
201 GArray *export; /**< array of FILE_INFO of exported files;
202 array size is always 1 unless we're
203 doing the multiple file option */
204 int net; /**< The actual client socket */
205 SERVER *server; /**< The server this client is getting data from */
206 char* difffilename; /**< filename of the copy-on-write file, if any */
207 int difffile; /**< filedescriptor of copyonwrite file. @todo
208 shouldn't this be an array too? (cfr export) Or
209 make -m and -c mutually exclusive */
210 u32 difffilelen; /**< number of pages in difffile */
211 u32 *difmap; /**< see comment on the global difmap for this one */
215 * Type of configuration file values
218 PARAM_INT, /**< This parameter is an integer */
219 PARAM_STRING, /**< This parameter is a string */
220 PARAM_BOOL, /**< This parameter is a boolean */
224 * Configuration file values
227 gchar *paramname; /**< Name of the parameter, as it appears in
229 gboolean required; /**< Whether this is a required (as opposed to
230 optional) parameter */
231 PARAM_TYPE ptype; /**< Type of the parameter. */
232 gpointer target; /**< Pointer to where the data of this
233 parameter should be written. If ptype is
234 PARAM_BOOL, the data is or'ed rather than
236 gint flagval; /**< Flag mask for this parameter in case ptype
241 * Check whether a client is allowed to connect. Works with an authorization
242 * file which contains one line per machine, no wildcards.
244 * @param opts The client who's trying to connect.
245 * @return 0 - authorization refused, 1 - OK
247 int authorized_client(CLIENT *opts) {
248 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
253 struct in_addr client;
254 struct in_addr cltemp;
257 if ((f=fopen(opts->server->authname,"r"))==NULL) {
258 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
259 opts->server->authname,strerror(errno)) ;
263 inet_aton(opts->clientname, &client);
264 while (fgets(line,LINELEN,f)!=NULL) {
265 if((tmp=index(line, '/'))) {
266 if(strlen(line)<=tmp-line) {
267 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
271 if(inet_aton(line,&addr)) {
272 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
275 len=strtol(tmp, NULL, 0);
276 addr.s_addr>>=32-len;
277 addr.s_addr<<=32-len;
278 memcpy(&cltemp,&client,sizeof(client));
279 cltemp.s_addr>>=32-len;
280 cltemp.s_addr<<=32-len;
281 if(addr.s_addr == cltemp.s_addr) {
285 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
295 * Read data from a file descriptor into a buffer
297 * @param f a file descriptor
298 * @param buf a buffer
299 * @param len the number of bytes to be read
301 inline void readit(int f, void *buf, size_t len) {
305 if ((res = read(f, buf, len)) <= 0)
306 err("Read failed: %m");
313 * Write data from a buffer into a filedescriptor
315 * @param f a file descriptor
316 * @param buf a buffer containing data
317 * @param len the number of bytes to be written
319 inline void writeit(int f, void *buf, size_t len) {
323 if ((res = write(f, buf, len)) <= 0)
324 err("Send failed: %m");
331 * Print out a message about how to use nbd-server. Split out to a separate
332 * function so that we can call it from multiple places
335 printf("This is nbd-server version " VERSION "\n");
336 printf("Usage: [ip:]port file_to_export [size][kKmM] [-l authorize_file] [-r] [-m] [-c] [-C configuration file] [-p PID file name] [-o section name]\n"
337 "\t-r|--read-only\t\tread only\n"
338 "\t-m|--multi-file\t\tmultiple file\n"
339 "\t-c|--copy-on-write\tcopy on write\n"
340 "\t-C|--config-file\tspecify an alternate configuration file\n"
341 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
342 "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n"
343 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
344 "\t-o|--output-config\toutput a config file section for what you\n\t\t\t\tspecified on the command line, with the\n\t\t\t\tspecified section name\n\n"
345 "\tif port is set to 0, stdin is used (for running from inetd)\n"
346 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
347 "\t\taddress of the machine trying to connect\n"
348 "\tif ip is set, it contains the local IP address on which we're listening.\n\tif not, the server will listen on all local IP addresses\n");
349 printf("Using configuration file %s\n", CFILE);
352 /* Dumps a config file section of the given SERVER*, and exits. */
353 void dump_section(SERVER* serve, gchar* section_header) {
354 printf("[%s]\n", section_header);
355 printf("\texportname = %s\n", serve->exportname);
356 printf("\tlistenaddr = %s\n", serve->listenaddr);
357 printf("\tport = %d\n", serve->port);
358 if(serve->flags & F_READONLY) {
359 printf("\treadonly = true\n");
361 if(serve->flags & F_MULTIFILE) {
362 printf("\tmultifile = true\n");
364 if(serve->flags & F_COPYONWRITE) {
365 printf("\tcopyonwrite = true\n");
367 if(serve->expected_size) {
368 printf("\tfilesize = %lld\n", (long long int)serve->expected_size);
370 if(serve->authname) {
371 printf("\tauthfile = %s\n", serve->authname);
377 * Parse the command line.
379 * @param argc the argc argument to main()
380 * @param argv the argv argument to main()
382 SERVER* cmdline(int argc, char *argv[]) {
386 struct option long_options[] = {
387 {"read-only", no_argument, NULL, 'r'},
388 {"multi-file", no_argument, NULL, 'm'},
389 {"copy-on-write", no_argument, NULL, 'c'},
390 {"authorize-file", required_argument, NULL, 'l'},
391 {"idle-time", required_argument, NULL, 'a'},
392 {"config-file", required_argument, NULL, 'C'},
393 {"pid-file", required_argument, NULL, 'p'},
394 {"output-config", required_argument, NULL, 'o'},
401 gboolean do_output=FALSE;
402 gchar* section_header="";
408 serve=g_new0(SERVER, 1);
409 serve->authname = g_strdup(default_authname);
410 serve->virtstyle=VIRT_IPLIT;
411 while((c=getopt_long(argc, argv, "-a:C:cl:mo:rp:", long_options, &i))>=0) {
414 /* non-option argument */
415 switch(nonspecial++) {
417 addr_port=g_strsplit(optarg, ":", 2);
419 serve->port=strtol(addr_port[1], NULL, 0);
420 serve->listenaddr=g_strdup(addr_port[0]);
422 serve->listenaddr=g_strdup("0.0.0.0");
423 serve->port=strtol(addr_port[0], NULL, 0);
425 g_strfreev(addr_port);
428 serve->exportname = g_strdup(optarg);
429 if(serve->exportname[0] != '/') {
430 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
435 last=strlen(optarg)-1;
437 if (suffix == 'k' || suffix == 'K' ||
438 suffix == 'm' || suffix == 'M')
440 es = (off_t)atoll(optarg);
448 serve->expected_size = es;
453 serve->flags |= F_READONLY;
456 serve->flags |= F_MULTIFILE;
460 section_header = g_strdup(optarg);
463 strncpy(pidftemplate, optarg, 256);
466 serve->flags |=F_COPYONWRITE;
469 g_free(config_file_pos);
470 config_file_pos=g_strdup(optarg);
473 g_free(serve->authname);
474 serve->authname=g_strdup(optarg);
482 /* What's left: the port to export, the name of the to be exported
483 * file, and, optionally, the size of the file, in that order. */
490 g_critical("Need a complete configuration on the command line to output a config file section!");
493 dump_section(serve, section_header);
499 * Error codes for config file parsing
502 CFILE_NOTFOUND, /**< The configuration file is not found */
503 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
504 CFILE_KEY_MISSING, /**< A (required) key is missing */
505 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
506 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
507 CFILE_PROGERR, /**< Programmer error */
508 CFILE_NO_EXPORTS /**< A config file was specified that does not
509 define any exports */
513 * Remove a SERVER from memory. Used from the hash table
515 void remove_server(gpointer s) {
519 g_free(server->exportname);
521 g_free(server->authname);
526 * Parse the config file.
528 * @param f the name of the config file
529 * @param e a GError. @see CFILE_ERRORS for what error values this function can
531 * @return a Array of SERVER* pointers, If the config file is empty or does not
532 * exist, returns an empty GHashTable; if the config file contains an
533 * error, returns NULL, and e is set appropriately
535 GArray* parse_cfile(gchar* f, GError** e) {
536 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
537 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
539 gchar *virtstyle=NULL;
541 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
542 { "port", TRUE, PARAM_INT, NULL, 0 },
543 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
544 { "filesize", FALSE, PARAM_INT, NULL, 0 },
545 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
546 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
547 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
548 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
549 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
550 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
551 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
552 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
553 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
555 const int lp_size=sizeof(lp)/sizeof(PARAM);
557 { "user", FALSE, PARAM_STRING, &runuser, 0 },
558 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
561 int p_size=sizeof(gp)/sizeof(PARAM);
564 const char *err_msg=NULL;
573 errdomain = g_quark_from_string("parse_cfile");
574 cfile = g_key_file_new();
575 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
576 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
577 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
578 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file.");
579 g_key_file_free(cfile);
582 startgroup = g_key_file_get_start_group(cfile);
583 if(!startgroup || strcmp(startgroup, "generic")) {
584 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
585 g_key_file_free(cfile);
588 groups = g_key_file_get_groups(cfile, NULL);
589 for(i=0;groups[i];i++) {
590 memset(&s, '\0', sizeof(SERVER));
591 lp[0].target=&(s.exportname);
592 lp[1].target=&(s.port);
593 lp[2].target=&(s.authname);
594 lp[3].target=&(s.expected_size);
595 lp[4].target=&(virtstyle);
596 lp[5].target=&(s.prerun);
597 lp[6].target=&(s.postrun);
598 lp[7].target=lp[8].target=lp[9].target=
599 lp[10].target=lp[11].target=&(s.flags);
600 lp[12].target=&(s.listenaddr);
602 /* After the [generic] group, start parsing exports */
607 for(j=0;j<p_size;j++) {
608 g_assert(p[j].target != NULL);
609 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
612 *((gint*)p[j].target) =
613 g_key_file_get_integer(cfile,
619 *((gchar**)p[j].target) =
620 g_key_file_get_string(cfile,
626 value = g_key_file_get_boolean(cfile,
628 p[j].paramname, &err);
631 *((gint*)p[j].target) |= p[j].flagval;
633 *((gint*)p[j].target) &= ~(p[j].flagval);
639 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
641 /* Ignore not-found error for optional values */
645 err_msg = MISSING_REQUIRED_ERROR;
648 err_msg = DEFAULT_ERROR;
650 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
651 g_array_free(retval, TRUE);
653 g_key_file_free(cfile);
658 if(!strncmp(virtstyle, "none", 4)) {
659 s.virtstyle=VIRT_NONE;
660 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
661 s.virtstyle=VIRT_IPLIT;
662 } else if(!strncmp(virtstyle, "iphash", 6)) {
663 s.virtstyle=VIRT_IPHASH;
664 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
665 s.virtstyle=VIRT_CIDR;
666 if(strlen(virtstyle)<10) {
667 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
668 g_array_free(retval, TRUE);
669 g_key_file_free(cfile);
672 s.cidrlen=strtol(virtstyle+8, NULL, 0);
674 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
675 g_array_free(retval, TRUE);
676 g_key_file_free(cfile);
680 s.virtstyle=VIRT_IPLIT;
682 /* Don't need to free this, it's not our string */
684 /* Don't append values for the [generic] group */
687 s.listenaddr = g_strdup("0.0.0.0");
689 g_array_append_val(retval, s);
692 if(s.flags & F_SDP) {
693 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
694 g_array_free(retval, TRUE);
695 g_key_file_free(cfile);
701 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
703 g_key_file_free(cfile);
708 * Signal handler for SIGCHLD
709 * @param s the signal we're handling (must be SIGCHLD, or something
712 void sigchld_handler(int s) {
717 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
718 if(WIFEXITED(status)) {
719 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
721 i=g_hash_table_lookup(children, &pid);
723 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
725 DEBUG2("Removing %d from the list of children", pid);
726 g_hash_table_remove(children, &pid);
732 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
735 * @param value the value corresponding to the above key
736 * @param user_data a pointer which we always set to 1, so that we know what
739 void killchild(gpointer key, gpointer value, gpointer user_data) {
741 int *parent=user_data;
748 * Handle SIGTERM and dispatch it to our children
749 * @param s the signal we're handling (must be SIGTERM, or something
750 * is severely wrong).
752 void sigterm_handler(int s) {
755 g_hash_table_foreach(children, killchild, &parent);
765 * Detect the size of a file.
767 * @param fhandle An open filedescriptor
768 * @return the size of the file, or OFFT_MAX if detection was
771 off_t size_autodetect(int fhandle) {
774 struct stat stat_buf;
777 #ifdef HAVE_SYS_MOUNT_H
778 #ifdef HAVE_SYS_IOCTL_H
780 DEBUG("looking for export size with ioctl BLKGETSIZE64\n");
781 if (!ioctl(fhandle, BLKGETSIZE64, bytes) && bytes) {
784 #endif /* BLKGETSIZE64 */
785 #endif /* HAVE_SYS_IOCTL_H */
786 #endif /* HAVE_SYS_MOUNT_H */
788 DEBUG("looking for fhandle size with fstat\n");
789 stat_buf.st_size = 0;
790 error = fstat(fhandle, &stat_buf);
792 if(stat_buf.st_size > 0)
793 return (off_t)stat_buf.st_size;
795 err("fstat failed: %m");
798 DEBUG("looking for fhandle size with lseek SEEK_END\n");
799 es = lseek(fhandle, (off_t)0, SEEK_END);
800 if (es > ((off_t)0)) {
803 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
806 err("Could not find size of exported block device: %m");
811 * Get the file handle and offset, given an export offset.
813 * @param export An array of export files
814 * @param a The offset to get corresponding file/offset for
815 * @param fhandle [out] File descriptor
816 * @param foffset [out] Offset into fhandle
817 * @param maxbytes [out] Tells how many bytes can be read/written
818 * from fhandle starting at foffset (0 if there is no limit)
819 * @return 0 on success, -1 on failure
821 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
822 /* Negative offset not allowed */
826 /* Binary search for last file with starting offset <= a */
829 int end = export->len - 1;
830 while( start <= end ) {
831 int mid = (start + end) / 2;
832 fi = g_array_index(export, FILE_INFO, mid);
833 if( fi.startoff < a ) {
835 } else if( fi.startoff > a ) {
843 /* end should never go negative, since first startoff is 0 and a >= 0 */
846 fi = g_array_index(export, FILE_INFO, end);
847 *fhandle = fi.fhandle;
848 *foffset = a - fi.startoff;
850 if( end+1 < export->len ) {
851 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
852 *maxbytes = fi_next.startoff - a;
859 * seek to a position in a file, with error handling.
860 * @param handle a filedescriptor
861 * @param a position to seek to
862 * @todo get rid of this; lastpoint is a global variable right now, but it
863 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
866 void myseek(int handle,off_t a) {
867 if (lseek(handle, a, SEEK_SET) < 0) {
868 err("Can not seek locally!\n");
873 * Write an amount of bytes at a given offset to the right file. This
874 * abstracts the write-side of the multiple file option.
876 * @param a The offset where the write should start
877 * @param buf The buffer to write from
878 * @param len The length of buf
879 * @param client The client we're serving for
880 * @return The number of bytes actually written, or -1 in case of an error
882 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
887 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
889 if(maxbytes && len > maxbytes)
892 DEBUG4("(WRITE to fd %d offset %llu len %u), ", fhandle, foffset, len);
894 myseek(fhandle, foffset);
895 return write(fhandle, buf, len);
899 * Call rawexpwrite repeatedly until all data has been written.
900 * @return 0 on success, nonzero on failure
902 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
905 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
910 return (ret < 0 || len != 0);
914 * Read an amount of bytes at a given offset from the right file. This
915 * abstracts the read-side of the multiple files option.
917 * @param a The offset where the read should start
918 * @param buf A buffer to read into
919 * @param len The size of buf
920 * @param client The client we're serving for
921 * @return The number of bytes actually read, or -1 in case of an
924 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
929 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
931 if(maxbytes && len > maxbytes)
934 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
936 myseek(fhandle, foffset);
937 return read(fhandle, buf, len);
941 * Call rawexpread repeatedly until all data has been read.
942 * @return 0 on success, nonzero on failure
944 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
947 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
952 return (ret < 0 || len != 0);
956 * Read an amount of bytes at a given offset from the right file. This
957 * abstracts the read-side of the copyonwrite stuff, and calls
958 * rawexpread() with the right parameters to do the actual work.
959 * @param a The offset where the read should start
960 * @param buf A buffer to read into
961 * @param len The size of buf
962 * @param client The client we're going to read for
963 * @return 0 on success, nonzero on failure
965 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
967 off_t mapcnt, mapl, maph, pagestart;
969 if (!(client->server->flags & F_COPYONWRITE))
970 return(rawexpread_fully(a, buf, len, client));
971 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
973 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
975 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
976 pagestart=mapcnt*DIFFPAGESIZE;
978 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
979 len : (size_t)DIFFPAGESIZE-offset;
980 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
981 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
982 (unsigned long)(client->difmap[mapcnt]));
983 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
984 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
985 } else { /* the block is not there */
986 DEBUG2("Page %llu is not here, we read the original one\n",
987 (unsigned long long)mapcnt);
988 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
990 len-=rdlen; a+=rdlen; buf+=rdlen;
996 * Write an amount of bytes at a given offset to the right file. This
997 * abstracts the write-side of the copyonwrite option, and calls
998 * rawexpwrite() with the right parameters to do the actual work.
1000 * @param a The offset where the write should start
1001 * @param buf The buffer to write from
1002 * @param len The length of buf
1003 * @param client The client we're going to write for.
1004 * @return 0 on success, nonzero on failure
1006 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1007 char pagebuf[DIFFPAGESIZE];
1008 off_t mapcnt,mapl,maph;
1013 if (!(client->server->flags & F_COPYONWRITE))
1014 return(rawexpwrite_fully(a, buf, len, client));
1015 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1017 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1019 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1020 pagestart=mapcnt*DIFFPAGESIZE ;
1021 offset=a-pagestart ;
1022 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1023 len : (size_t)DIFFPAGESIZE-offset;
1025 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1026 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1027 (unsigned long)(client->difmap[mapcnt])) ;
1028 myseek(client->difffile,
1029 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1030 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1031 } else { /* the block is not there */
1032 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1033 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1034 DEBUG3("Page %llu is not here, we put it at %lu\n",
1035 (unsigned long long)mapcnt,
1036 (unsigned long)(client->difmap[mapcnt]));
1037 rdlen=DIFFPAGESIZE ;
1038 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1040 memcpy(pagebuf+offset,buf,wrlen) ;
1041 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1045 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1051 * Do the initial negotiation.
1053 * @param client The client we're negotiating with.
1055 void negotiate(CLIENT *client) {
1058 u32 flags = NBD_FLAG_HAS_FLAGS;
1060 memset(zeros, '\0', sizeof(zeros));
1061 if (write(client->net, INIT_PASSWD, 8) < 0)
1062 err("Negotiation failed: %m");
1063 cliserv_magic = htonll(cliserv_magic);
1064 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1065 err("Negotiation failed: %m");
1066 size_host = htonll((u64)(client->exportsize));
1067 if (write(client->net, &size_host, 8) < 0)
1068 err("Negotiation failed: %m");
1069 if (client->server->flags & F_READONLY)
1070 flags |= NBD_FLAG_READ_ONLY;
1071 flags = htonl(flags);
1072 if (write(client->net, &flags, 4) < 0)
1073 err("Negotiation failed: %m");
1074 if (write(client->net, zeros, 124) < 0)
1075 err("Negotiation failed: %m");
1078 /** sending macro. */
1079 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1081 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1083 * Serve a file to a single client.
1085 * @todo This beast needs to be split up in many tiny little manageable
1086 * pieces. Preferably with a chainsaw.
1088 * @param client The client we're going to serve to.
1089 * @return when the client disconnects
1091 int mainloop(CLIENT *client) {
1092 struct nbd_request request;
1093 struct nbd_reply reply;
1094 gboolean go_on=TRUE;
1099 DEBUG("Entering request loop!\n");
1100 reply.magic = htonl(NBD_REPLY_MAGIC);
1109 readit(client->net, &request, sizeof(request));
1110 request.from = ntohll(request.from);
1111 request.type = ntohl(request.type);
1113 if (request.type==NBD_CMD_DISC) {
1114 msg2(LOG_INFO, "Disconnect request received.");
1115 if (client->server->flags & F_COPYONWRITE) {
1116 if (client->difmap) g_free(client->difmap) ;
1117 close(client->difffile);
1118 unlink(client->difffilename);
1119 free(client->difffilename);
1125 len = ntohl(request.len);
1127 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1128 err("Not enough magic.");
1129 if (len > BUFSIZE + sizeof(struct nbd_reply))
1130 err("Request too big!");
1132 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1133 "READ", (unsigned long long)request.from,
1134 (unsigned long long)request.from / 512, len);
1136 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1137 if ((request.from + len) > (OFFT_MAX)) {
1138 DEBUG("[Number too large!]");
1139 ERROR(client, reply, EINVAL);
1143 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1145 ERROR(client, reply, EINVAL);
1149 if (request.type==NBD_CMD_WRITE) {
1150 DEBUG("wr: net->buf, ");
1151 readit(client->net, buf, len);
1152 DEBUG("buf->exp, ");
1153 if ((client->server->flags & F_READONLY) ||
1154 (client->server->flags & F_AUTOREADONLY)) {
1155 DEBUG("[WRITE to READONLY!]");
1156 ERROR(client, reply, EPERM);
1159 if (expwrite(request.from, buf, len, client)) {
1160 DEBUG("Write failed: %m" );
1161 ERROR(client, reply, errno);
1164 SEND(client->net, reply);
1170 DEBUG("exp->buf, ");
1171 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1172 DEBUG("Read failed: %m");
1173 ERROR(client, reply, errno);
1177 DEBUG("buf->net, ");
1178 memcpy(buf, &reply, sizeof(struct nbd_reply));
1179 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1186 * Set up client export array, which is an array of FILE_INFO.
1187 * Also, split a single exportfile into multiple ones, if that was asked.
1188 * @param client information on the client which we want to setup export for
1190 void setupexport(CLIENT* client) {
1192 off_t laststartoff = 0, lastsize = 0;
1193 int multifile = (client->server->flags & F_MULTIFILE);
1195 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1197 /* If multi-file, open as many files as we can.
1198 * If not, open exactly one file.
1199 * Calculate file sizes as we go to get total size. */
1203 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1206 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1208 tmpname=g_strdup(client->exportname);
1210 DEBUG2( "Opening %s\n", tmpname );
1211 fi.fhandle = open(tmpname, mode);
1212 if(fi.fhandle == -1 && mode == O_RDWR) {
1213 /* Try again because maybe media was read-only */
1214 fi.fhandle = open(tmpname, O_RDONLY);
1215 if(fi.fhandle != -1) {
1216 /* Opening the base file in copyonwrite mode is
1218 if(!(client->server->flags & F_COPYONWRITE)) {
1219 client->server->flags |= F_AUTOREADONLY;
1220 client->server->flags |= F_READONLY;
1224 if(fi.fhandle == -1) {
1225 if(multifile && i>0)
1227 err("Could not open exported file: %m");
1229 fi.startoff = laststartoff + lastsize;
1230 g_array_append_val(client->export, fi);
1233 /* Starting offset and size of this file will be used to
1234 * calculate starting offset of next file */
1235 laststartoff = fi.startoff;
1236 lastsize = size_autodetect(fi.fhandle);
1242 /* Set export size to total calculated size */
1243 client->exportsize = laststartoff + lastsize;
1245 /* Export size may be overridden */
1246 if(client->server->expected_size) {
1247 /* desired size must be <= total calculated size */
1248 if(client->server->expected_size > client->exportsize) {
1249 err("Size of exported file is too big\n");
1252 client->exportsize = client->server->expected_size;
1255 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1257 msg3(LOG_INFO, "Total number of files: %d", i);
1261 int copyonwrite_prepare(CLIENT* client) {
1263 if ((client->difffilename = malloc(1024))==NULL)
1264 err("Failed to allocate string for diff file name");
1265 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1267 client->difffilename[1023]='\0';
1268 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1269 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1270 if (client->difffile<0) err("Could not create diff file (%m)") ;
1271 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1272 err("Could not allocate memory") ;
1273 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1279 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1282 * @param command the command to be ran. Read from the config file
1283 * @param file the file name we're about to export
1285 int do_run(gchar* command, gchar* file) {
1289 if(command && *command) {
1290 cmd = g_strdup_printf(command, file);
1298 * Serve a connection.
1300 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1301 * follow the road map.
1303 * @param client a connected client
1305 void serveconnection(CLIENT *client) {
1306 if(do_run(client->server->prerun, client->exportname)) {
1309 setupexport(client);
1311 if (client->server->flags & F_COPYONWRITE) {
1312 copyonwrite_prepare(client);
1315 setmysockopt(client->net);
1318 do_run(client->server->postrun, client->exportname);
1322 * Find the name of the file we have to serve. This will use g_strdup_printf
1323 * to put the IP address of the client inside a filename containing
1324 * "%s" (in the form as specified by the "virtstyle" option). That name
1325 * is then written to client->exportname.
1327 * @param net A socket connected to an nbd client
1328 * @param client information about the client. The IP address in human-readable
1329 * format will be written to a new char* buffer, the address of which will be
1330 * stored in client->clientname.
1332 void set_peername(int net, CLIENT *client) {
1333 struct sockaddr_in addrin;
1334 struct sockaddr_in netaddr;
1335 size_t addrinlen = sizeof( addrin );
1341 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1342 err("getsockname failed: %m");
1343 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1344 switch(client->server->virtstyle) {
1346 client->exportname=g_strdup(client->server->exportname);
1349 for(i=0;i<strlen(peername);i++) {
1350 if(peername[i]=='.') {
1355 client->exportname=g_strdup_printf(client->server->exportname, peername);
1358 memcpy(&netaddr, &addrin, addrinlen);
1359 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1360 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1361 netname = inet_ntoa(netaddr.sin_addr);
1362 tmp=g_strdup_printf("%s/%s", netname, peername);
1363 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1367 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1368 peername, client->exportname);
1369 client->clientname=g_strdup(peername);
1375 * @param data a pointer to pid_t which should be freed
1377 void destroy_pid_t(gpointer data) {
1382 * Loop through the available servers, and serve them. Never returns.
1384 int serveloop(GArray* servers) {
1385 struct sockaddr_in addrin;
1386 socklen_t addrinlen=sizeof(addrin);
1395 * Set up the master fd_set. The set of descriptors we need
1396 * to select() for never changes anyway and it buys us a *lot*
1397 * of time to only build this once. However, if we ever choose
1398 * to not fork() for clients anymore, we may have to revisit
1403 for(i=0;i<servers->len;i++) {
1404 sock=(g_array_index(servers, SERVER, i)).socket;
1405 FD_SET(sock, &mset);
1406 max=sock>max?sock:max;
1413 memcpy(&rset, &mset, sizeof(fd_set));
1414 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1416 for(i=0;i<servers->len;i++) {
1417 serve=&(g_array_index(servers, SERVER, i));
1418 if(FD_ISSET(serve->socket, &rset)) {
1420 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1423 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1424 err("fcntl F_GETFL");
1426 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1427 err("fcntl F_SETFL ~O_NONBLOCK");
1429 client = g_malloc(sizeof(CLIENT));
1430 client->server=serve;
1431 client->exportsize=OFFT_MAX;
1433 set_peername(net, client);
1434 if (!authorized_client(client)) {
1435 msg2(LOG_INFO,"Unauthorized client") ;
1439 msg2(LOG_INFO,"Authorized client") ;
1440 pid=g_malloc(sizeof(pid_t));
1442 if ((*pid=fork())<0) {
1443 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1447 if (*pid>0) { /* parent */
1449 g_hash_table_insert(children, pid, pid);
1453 g_hash_table_destroy(children);
1454 for(i=0;i<servers->len;i++) {
1455 serve=&g_array_index(servers, SERVER, i);
1456 close(serve->socket);
1458 /* FALSE does not free the
1459 actual data. This is required,
1460 because the client has a
1461 direct reference into that
1462 data, and otherwise we get a
1464 g_array_free(servers, FALSE);
1466 msg2(LOG_INFO,"Starting to serve");
1467 serveconnection(client);
1476 * Connect a server's socket.
1478 * @param serve the server we want to connect.
1480 void setup_serve(SERVER *serve) {
1481 struct sockaddr_in addrin;
1482 struct sigaction sa;
1483 int addrinlen = sizeof(addrin);
1494 if ((serve->flags) && F_SDP) {
1498 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1501 /* lose the pesky "Address already in use" error message */
1502 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1503 err("setsockopt SO_REUSEADDR");
1505 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1506 err("setsockopt SO_KEEPALIVE");
1509 /* make the listening socket non-blocking */
1510 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1511 err("fcntl F_GETFL");
1513 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1514 err("fcntl F_SETFL O_NONBLOCK");
1517 DEBUG("Waiting for connections... bind, ");
1518 addrin.sin_family = AF_INET;
1520 if(serve->flags & F_SDP) {
1521 addrin.sin_family = AF_INET_SDP;
1524 addrin.sin_port = htons(serve->port);
1525 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr)))
1526 err("could not parse listen address");
1527 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1530 if (listen(serve->socket, 1) < 0)
1532 sa.sa_handler = sigchld_handler;
1533 sigemptyset(&sa.sa_mask);
1534 sa.sa_flags = SA_RESTART;
1535 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1536 err("sigaction: %m");
1537 sa.sa_handler = sigterm_handler;
1538 sigemptyset(&sa.sa_mask);
1539 sa.sa_flags = SA_RESTART;
1540 if(sigaction(SIGTERM, &sa, NULL) == -1)
1541 err("sigaction: %m");
1545 * Connect our servers.
1547 void setup_servers(GArray* servers) {
1550 for(i=0;i<servers->len;i++) {
1551 setup_serve(&(g_array_index(servers, SERVER, i)));
1553 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1557 * Go daemon (unless we specified at compile time that we didn't want this)
1558 * @param serve the first server of our configuration. If its port is zero,
1559 * then do not daemonize, because we're doing inetd then. This parameter
1560 * is only used to create a PID file of the form
1561 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1563 #if !defined(NODAEMON) && !defined(NOFORK)
1564 void daemonize(SERVER* serve) {
1567 if(serve && !(serve->port)) {
1573 if(!*pidftemplate) {
1575 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1577 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1580 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1581 pidf=fopen(pidfname, "w");
1583 fprintf(pidf,"%d\n", (int)getpid());
1587 fprintf(stderr, "Not fatal; continuing");
1591 #define daemonize(serve)
1592 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1595 * Everything beyond this point (in the file) is run in non-daemon mode.
1596 * The stuff above daemonize() isn't.
1599 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1601 void serve_err(SERVER* serve, const char* msg) {
1602 g_message("Export of %s on port %d failed:", serve->exportname,
1608 * Set up user-ID and/or group-ID
1610 void dousers(void) {
1614 gr=getgrnam(rungroup);
1616 g_message("Invalid group name: %s", rungroup);
1619 if(setgid(gr->gr_gid)<0) {
1620 g_message("Could not set GID: %s", strerror(errno));
1625 pw=getpwnam(runuser);
1627 g_message("Invalid user name: %s", runuser);
1630 if(setuid(pw->pw_uid)<0) {
1631 g_message("Could not set UID: %s", strerror(errno));
1638 void glib_message_syslog_redirect(const gchar *log_domain,
1639 GLogLevelFlags log_level,
1640 const gchar *message,
1643 int level=LOG_DEBUG;
1647 case G_LOG_FLAG_FATAL:
1648 case G_LOG_LEVEL_CRITICAL:
1649 case G_LOG_LEVEL_ERROR:
1652 case G_LOG_LEVEL_WARNING:
1655 case G_LOG_LEVEL_MESSAGE:
1656 case G_LOG_LEVEL_INFO:
1659 case G_LOG_LEVEL_DEBUG:
1662 syslog(level, message);
1667 * Main entry point...
1669 int main(int argc, char *argv[]) {
1674 if (sizeof( struct nbd_request )!=28) {
1675 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1676 exit(EXIT_FAILURE) ;
1679 memset(pidftemplate, '\0', 256);
1682 config_file_pos = g_strdup(CFILE);
1683 serve=cmdline(argc, argv);
1684 servers = parse_cfile(config_file_pos, &err);
1687 g_array_append_val(servers, *serve);
1689 if (!(serve->port)) {
1692 /* You really should define ISSERVER if you're going to use
1693 * inetd mode, but if you don't, closing stdout and stderr
1694 * (which inetd had connected to the client socket) will let it
1698 open("/dev/null", O_WRONLY);
1699 open("/dev/null", O_WRONLY);
1700 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
1702 client=g_malloc(sizeof(CLIENT));
1703 client->server=serve;
1705 client->exportsize=OFFT_MAX;
1706 set_peername(0,client);
1707 serveconnection(client);
1712 if(!servers || !servers->len) {
1713 g_warning("Could not parse config file: %s",
1714 err ? err->message : "Unknown error");
1717 if((!serve) && (!servers||!servers->len)) {
1718 g_message("Nothing to do! Bye!");
1722 setup_servers(servers);